Special adaptor ring for this ultra wide-angle tilt-and-shift lens

This new ring will adapt the Foundation kit filter holder to fit the Canon 17mm TS-E lens and will allow more than half of the total amount of movement that is normally possible with this lens before vignetting - we feel that this is adequate for most uses and using the smaller 100mm system will allow the use of popular 100mm filters such as the Big Stopper and Proglass range. You can even use the 105mm polariser if you allow for a small amount of cutoff at the corners